Objectives

The validity (sensitivity and specificity) of a preschool vision screening progran was measured over a 3-year period to determine how well struthsmus and significant refractive errors could be detected.

Methods

Public health nurses were trained to administer tests of visual acuity, stereoacuity, and ocular alignment.

Failure on any test, visual acuity of 6/9 or less, stereoacuity of less than 100 seconds of arc, or an apparent misalignment of the eyes resulted in referral to an eye care practhioner.

The annually calculated prevalence of vision problems ranged between 10.5% and 13.8%. The estimated sensitivity vared from 60.4% to 70.9% (specificity, 69.6% to 79.9%). The yield indicated that a very high percentage of children with vision problems were identified for the first time, Conclusions The validity of this serconing is comparable to that of other school screenings.

The limitations are predictable

Consideration should be given to replacing visual acuity tests with a rapid, objective measure of refractive error and ocular alignment.